Aerial dioxygen activation <i>vs.</i> thiol–ene click reaction within a system
作者:Khokan Choudhuri、Arkalekha Mandal、Prasenjit Mal
DOI:10.1039/c8cc01359d
日期:——
Markovnikov or anti-Markovnikov selective thiol–ene click (TEC) reactions and the synthesis of β-hydroxysulfides via aerial dioxygen activation are prevalent C–S bond forming reactions of styrenes and thiophenols. Herein, by choosing appropriate environments using solvents with additives or neat conditions, any one of these three reactions was achieved exclusively in excellent yields.
Selectivities in the Reactions of Alkyl-, Aryl- and Heterosubstituted Organotitanium Compounds Preliminary Communication
作者:Beat Weidmann、Leo Widler、Alan G. Olivero、Christopher D. Maycock、Dieter Seebach
DOI:10.1002/hlca.19810640136
日期:1981.2.4
Solutions of the title compounds R-Ti(OR′)3 (1) are generally available from organolithium (or magnesium) derivatives according to equation 1. It is shown (Table 1) that some heterosubstitutedorganotitaniumcompounds are more stable thermally than their lithium counterparts. The reagents 1 are highly selective carbonylophiles (Tables 1 and 2), their reactivity can be modified by variation of the R′O-group
Stereoselective synthesis of 3,4-di-substituted mercaptolactones via photoredox-catalyzed radical addition of thiophenols
作者:Farzana Kouser、Vijay Kumar Sharma、Masood Rizvi、Shaista Sultan、Neha Chalotra、Vivek K. Gupta、Utpal Nandi、Bhahwal Ali Shah
DOI:10.1016/j.tetlet.2018.04.046
日期:2018.5
A visible light mediated radical addition of thiophenols on 4-phenylbut-3-enoic acids to give diastereoselective synthesis of 3,4-disubstituted γ-lactones is reported. The reaction precludes the conventional prerequisite of conjugate addition. Furthermore, the lactones were successfully utilized in the synthesis of γ-ketoamides.
Solvent-mediated switching between oxidative addition and addition–oxidation: access to β-hydroxysulfides and β-arylsulfones by the addition of thiols to olefins in the presence of Oxone
The reaction between aryl olefins and thiols in the presence of Oxone in toluene–water (9 : 1, v/v) affords β-hydroxy-2-arylethyl aryl sulfides smoothly by the interception of intermediary thiyl radicals with aryl olefins; the former are generated by the oxidation of thiols with Oxone in a biphasic medium. However, the change of the solvent system to acetonitrile–water facilitates a nonradical and
Fluoride ion induced reaction of phenylthiomethyltrimethylsilane (1) with aldehydes and ketones: a simple procedure for the formation of β-hydroxyphenylsulphides
作者:John Kitteringham、Michael B Mitchell
DOI:10.1016/0040-4039(88)85151-7
日期:1988.1
The tetra -butylammonium fluoride (TBAF) initiated reaction of pheny1thiomethyltrimethysilane (1) with aldehydes and ketones is reported. ß-Hydroxy-phenylsulphides are formed in good yields even with ketones that contain enolisable protons. In contrast, the reaction of the organosilane (1) with pyridine -oxide failed to give any 2-phenylthiomethylpyridine. Methy1thiomethyltrimethylsilane (4) was found